Mollerup Amp Works & Crucible Guitars
Mollerup Amp Works & Crucible Guitars
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Biasing a '65 Fender Bassman
The electricians are still in and out of the wood shop so I can't work out there today! We have an old Fender Bassman, which is one of our favourite amps. We've been noticing lately that it hasn't been sounding as good as usual so, it's time to replace the tubes. I thought this would be a good opportunity to show you how I bias a tube amp. This one is a bit long but, there's a lot to cover.
Chapter Markers
00:00 Intro
00:15 Disclaimer (BE SAFE)
01:17 What's Going on In the Wood Shop
02:48 The Amp
04:26 Types of Bias
07:12 Grid Bias
09:01 Fixed vs Adjustable Fixed Bias
09:47 Bias Balance?
13:36 Considerations
18:16 Outside/Inside
19:13 Data Tracking Chart
21:44 Dissipation
23:36 Drain the Capacitors
25:40 What's a "Pull"
26:43 Measuring OT Resistance
28:17 OT Voltage Drop
30:06 Plate Voltage
31:36 Calculations
34:06 Bonus Biasing Method
38:39 Adjusting the Bias
42:21 Analyzing the Data
51:21 Conclusion
51:50 Outro
Please like and subscribe, share the video, push that play button, and enjoy!
Check out my band, One Soul Thrust, ua-cam.com/users/OneSoulThrustRock.
All four of our albums are available to stream any time you like. So head on over there If you are a fan of classic '70's style rock and give us a listen!
Our most recent album, "Slaves to the Sky, Masters to the Mess" - ua-cam.com/video/Y327N0IzbtM/v-deo.htmlsi=JZeDseW8hz_oxB54
Our 2016 double EP set, "Hold The Vision, Trust the Process" - ua-cam.com/video/_kvBSjLPNRU/v-deo.htmlsi=Yt37gGHIJifPbDqM
Our second album, "Know One Knows" - ua-cam.com/video/-xQbqPtJPS8/v-deo.htmlsi=0SDm_iVbZ-P-neQL
Our first album, "1ST", featuring a guest appearance by Glenn Hughes - ua-cam.com/video/qCt9zpAiUWQ/v-deo.htmlsi=bNT7hi7ewblvQ1UW
Thanks for watching!
#jagenstein #jagensteining
Переглядів: 56

Відео

2024 Shop Rebuild Pt 5 - What Plan?
Переглядів 18321 годину тому
Working off-the-cuff today! I have electricians running in and out of the shop, so I'm just shooting whatever I can and we'll see what we get. Chapter Markers 00:00 Intro 00:14 Electrical 02:34 Discussion 04:16 Sand & Finish the Workbench 06:15 Installing a Bench Vise 12:10 Electrical 2 12:59 Power Tool Bench 13:36 No Power On the Back Wall 14:23 Power Tool Bench 2 16:25 The Plan for the Tool W...
2024 Shop Rebuild Pt 4 - Workbench Upgrade 2
Переглядів 31914 днів тому
The workbench upgrade is done . . . . . . mostly. I still need to sand the top and put some finish on it (maybe). It's looking good and I'm really happy with how solid it is. Chapter Markers 00:00 Intro 00:14 Discussion 00:46 Removing the Top 00:55 Assessing the Planks 03:11 Prepping the Frame 05:17 Strengthening the Joints 06:29 Trimming & Planing 08:00 Re-Installing the Top 12:31 Conclusion 1...
2024 Shop Rebuild Pt 3 - Workbench Upgrade 1
Переглядів 13428 днів тому
Today, finally, I start on a project I've been wanting to do for a long time, upgrading my "catchall" workbench so it came become my main bench. Chapter Markers 00:00 Intro 00:15 Discussion 03:11 Mice! 05:16 Off-Cuts 06:07 Moms Solitaire Board 06:28 Assessment 12:29 The Fiddly Bits 13:17 Mid-Episode Unboxing 14:51 Installing the Flip Casters 16:25 Conclusion 17:33 Outro Please like and subscrib...
2024 Shop Rebuild Pt 2 - Electrical Panel Installation
Переглядів 45Місяць тому
A short one today, installing the new (to me) electrical panel. Please like and subscribe, share the video, push that play button, and enjoy! Check out my band, One Soul Thrust, ua-cam.com/users/OneSoulThrustRock. All four of our albums are available to stream any time you like. So head on over there If you are a fan of classic '70's style rock and give us a listen! Our most recent album, "Slav...
2024 Shop Rebuild Pt 1 - Rough Plans
Переглядів 116Місяць тому
I'm back from the "Tinkercation" but still in a tinkering mood, so I've decided to go with it! I'm going to do a bunch of shop rebuilding that I have been putting off for a while. In this video I will discuss some of what I'm thinking and layout what I'm planning to do over the next couple of months in the shop. Chapter Markers 00:00 Intro 00:18 Electrical 03:03 Work Surfaces 04:04 Large Storag...
2024 Fall Shop Update
Переглядів 46Місяць тому
Where have I been, what's going on?!? Please like and subscribe, share the video, push that play button, and enjoy! Check out my band, One Soul Thrust, ua-cam.com/users/OneSoulThrustRock. All four of our albums are available to stream any time you like. So head on over there If you are a fan of classic '70's style rock and give us a listen! Our most recent album, "Slaves to the Sky, Masters to ...
Tube Bass Preamp Part 5
Переглядів 2,1 тис.2 місяці тому
Back to work! Today I'm going to drill the mounting holes for the controls and connections. We're getting very close to wiring up the whole thing and testing it out! Chapter Markers 00:00 Intro 00:15 Discussion 00:41 The Plan 04:16 "Get Away From My Door" 04:50 Summary 06:58 Next Steps 08:46 Outro Please like and subscribe, share the video, push that play button, and enjoy! Check out my band, O...
New Test Equipment
Переглядів 1413 місяці тому
The "Tinkercation" has been much needed and my batteries are almost fully recharged. I'm taking this time away to take care of some outstanding "improvement" projects. I also ordered some new test equipment I've been needing for a while and it arrived this week. Here is an unboxing and brief demonstration of the new gear. You'll be seeing a lot of these pieces of equipment whenever I'm doing el...
Galaxy Rise Over Paagman's Mountain
Переглядів 1023 місяці тому
We got away to the Kootenay Mountains for a few days last week to decompress and reflect after 18 months of loss. I took some of my camera gear with me and took my first shot at astrophotography. There was an almost full moon to the left of the frame and it was still close to the solstice, so I wasn’t expecting this to be more than a practice lapse. It turned out better than I expected so I tho...
Tribute
Переглядів 463 місяці тому
Several days ago we had to say goodbye to our little Shanti. I'm going to take the next several weeks to process everything that has happened in the last 18 months or so. I'll be back in mid-July. The footage at the end of this video was shot several days before Shanti's passing. One of the things I always enjoyed at the end of a busy day working in my shop, was going into the house to feed Sha...
Tube Bass Preamp Part 4
Переглядів 2454 місяці тому
I realized that I had two options for building the power supply with the transformer I ordered, one lower voltage and one higher voltage. In this video I describe both versions of the power supply and build them both on my test rig. I'll also tell you which one I'm going to use in the final build, and why. Chapter Markers 00:00 Intro 00:14 Disclaimer 00:48 Discussion 02:42 Power Supply 1 04:24 ...
Tube Bass Preamp Part 3
Переглядів 1754 місяці тому
I was going to work on the power supply today, but someone asked a very good question so I went down a rabbit hole! What is negative feedback (not that kind)? The parts I ordered came in so I'll show you those too. Chapter Markers 00:00 Intro 00:27 Discussion 00:36 Positive Feedback Description 01:53 What Is a Coupling Capacitor? 03:50 Why Do My Controls Sound Scratchy? 05:12 What Else Can a Ca...
Tube Bass Preamp Part 2
Переглядів 1 тис.4 місяці тому
Today I get the circuit card populated and soldered and I discuss my decision regarding the power supply. Chapter Markers 00:00 Intro 00:14 Oops 01:48 Populate & Solder the Circuit Card 09:14 Power Supply Discussion & Description 14:32 Conclusion 15:51 Outro Please like and subscribe, share the video, push that play button, and enjoy! Check out my band, One Soul Thrust, ua-cam.com/users/OneSoul...
Tube Bass Preamp Part 1
Переглядів 6944 місяці тому
In part one of this series I detail the schematic and layout diagrams for the preamp, and make the circuit card. Chapter Markers 00:00 Intro 00:14 Schematic 04:23 Layout 10:20 Circuit Card Template & Mock-Up 13:31 Making the Card 14:52 Conclusion 16:01 Outro Please like and subscribe, share the video, push that play button, and enjoy! Check out my band, One Soul Thrust, ua-cam.com/users/OneSoul...
Spring 2024 Update
Переглядів 775 місяців тому
Spring 2024 Update
CNC Pickup Winder Ep. 10 - Troubles, Testing & Calibration
Переглядів 1636 місяців тому
CNC Pickup Winder Ep. 10 - Troubles, Testing & Calibration
CNC Pickup Winder Ep. 9 - First Wind!
Переглядів 4736 місяців тому
CNC Pickup Winder Ep. 9 - First Wind!
CNC Pickup Winder Ep. 8 - Software & Performance Testing & Tweaking
Переглядів 1407 місяців тому
CNC Pickup Winder Ep. 8 - Software & Performance Testing & Tweaking
CNC Pickup Winder Ep. 7 - Dr. Jagenstein's Monster
Переглядів 1137 місяців тому
CNC Pickup Winder Ep. 7 - Dr. Jagenstein's Monster
CNC Pickup Winder Ep. 6 - Parts is Parts
Переглядів 1407 місяців тому
CNC Pickup Winder Ep. 6 - Parts is Parts
CNC Pickup Winder Ep. 5 - The Tower
Переглядів 1197 місяців тому
CNC Pickup Winder Ep. 5 - The Tower
CNC Pickup Winder Ep. 4 - Bobbin Plate
Переглядів 1398 місяців тому
CNC Pickup Winder Ep. 4 - Bobbin Plate
Shop Jig - Quick & Dirty Circle Jig
Переглядів 868 місяців тому
Shop Jig - Quick & Dirty Circle Jig
Outtakes - Cold! It's Really Cold!!!
Переглядів 328 місяців тому
Outtakes - Cold! It's Really Cold!!!
CNC Pickup Winder Ep. 3 - Cabinet Completion
Переглядів 968 місяців тому
CNC Pickup Winder Ep. 3 - Cabinet Completion
CNC Pickup Winder Ep. 2 - Cabinet & Platform
Переглядів 1528 місяців тому
CNC Pickup Winder Ep. 2 - Cabinet & Platform
CNC Pickup Winder Ep. 1 - Introduction to the Build
Переглядів 4218 місяців тому
CNC Pickup Winder Ep. 1 - Introduction to the Build
Make It Stop - The Final Episode of My GGBO 2022 Build
Переглядів 1369 місяців тому
Make It Stop - The Final Episode of My GGBO 2022 Build
January 2024 Update - What Happens to Boiling Water at -40?
Переглядів 799 місяців тому
January 2024 Update - What Happens to Boiling Water at -40?

КОМЕНТАРІ

  • @BradsGuitarGarage
    @BradsGuitarGarage 14 годин тому

    Great to see another channel who knows what they're talking about. A very accurate and comprehensive video. Well done. We need to share and recognize those channels who are legitimate, in a sea of uninformed misinformation. Keep fighting the good fight, mate!

    • @JagStar
      @JagStar 10 годин тому

      @@BradsGuitarGarage thanks Brad. I just checked out your channel and subscribed. I’m looking forward to watching more!

  • @onesoulthrust
    @onesoulthrust 3 дні тому

    Buy a sanamp??

  • @jimhhenry2898
    @jimhhenry2898 3 дні тому

    can this be used with an Icon or any other midi control surface?

    • @JagStar
      @JagStar 3 дні тому

      I've never used the iCon surface, but I would assume you could. Behringer or iCon Pro Audio could probably answer that better than me. Thanks for commenting. :)

  • @jonahguitarguy
    @jonahguitarguy 8 днів тому

    The bench looks great! Handy little vise a s well. I have a bigger shop, not bragging just setting this up. I put 4" boxes every six feet around the whole shop. A 4" box has four outlets. Now of course some are not convenient to access because, for instance, my grizzly 24" drum sander ended up right in front of one box. I have 4 outlets at both ends of my tech bench. That's eight outlets within arms reach. They are all full to the point that I have to change cords sometimes to accommodate the demand. So I said all this to say, you might want to have some power on the wall behind you. If not for the immediate need but for the unforeseen future. Maybe for battery charge selves on the tool wall.

    • @JagStar
      @JagStar 8 днів тому

      Thanks for the advice Dane. There is one on the “back” wall and it’s my plan to use it for the chargers. I might actually install a four there just to have some options. I also have lots of room in the panel so I can expand when needed. I’ve been working with a total of eight outlets, including the extension cord I use to bring in power from a plug outside. I’ll be at 10 without the extension cord when this is done so I’ll already be a bit ahead. And my table saw will be required to one of the 220s. 😊

  • @onesoulthrust
    @onesoulthrust 9 днів тому

    How many electricians does it take to screw in a light bulb...😂

    • @JagStar
      @JagStar 9 днів тому

      Three! A project manager to tell the supervisor to do it who will delegate it to an apprentice. Unless the project manager sends the supervisor and apprentice to a different project, then is doesn't happen. 🤣

    • @onesoulthrust
      @onesoulthrust 7 днів тому

      @@JagStar We know that's true don't we?😂

    • @JagStar
      @JagStar 7 днів тому

      @@onesoulthrust 😂

  • @LaurenceMollerup
    @LaurenceMollerup 9 днів тому

    Used to be, "Hey look at this new Strat!" and now it's all "Look at my new circuit panel!" ;) Great to see this space coming together, you'll get years of enjoyment out of a good, organized shop.

    • @JagStar
      @JagStar 9 днів тому

      @@LaurenceMollerup I’m renovating the shop so I can get to, “Hey look at this new Strat I built!” 😊

  • @onesoulthrust
    @onesoulthrust 17 днів тому

    It's super solid.

    • @JagStar
      @JagStar 17 днів тому

      It will serve for another 50 years! :)

  • @jonahguitarguy
    @jonahguitarguy 17 днів тому

    Solid plan! Looks good.

    • @JagStar
      @JagStar 17 днів тому

      @@jonahguitarguy Thanks Dane.

  • @assabjorn
    @assabjorn 18 днів тому

    Clutch

  • @assabjorn
    @assabjorn 18 днів тому

    Wow i use 3 weeks for hand winding ,how fast you want 😂😂,

  • @assabjorn
    @assabjorn 18 днів тому

    Awsome job

    • @JagStar
      @JagStar 18 днів тому

      @@assabjorn thanks.

  • @assabjorn
    @assabjorn 18 днів тому

    Awsome

  • @assabjorn
    @assabjorn 18 днів тому

    Im tonns try this on tesla coil Winder😊

  • @assabjorn
    @assabjorn 19 днів тому

    Awsome thanks ❤

  • @assabjorn
    @assabjorn 19 днів тому

    Cool

    • @JagStar
      @JagStar 19 днів тому

      @@assabjorn thank you. I should be finishing this one up sometime in November. Making the most of the good fall weather to get some yard and wood shop projects done.

  • @onesoulthrust
    @onesoulthrust 28 днів тому

    So much transition. Your chapter markers are interesting in themselves. Mice?? 🙄

    • @JagStar
      @JagStar 28 днів тому

      @@onesoulthrust well past the time to organize. 😊 Yup, mice! 😤

  • @lucyfuir6386
    @lucyfuir6386 Місяць тому

    You could also have used a under mount tube socket.

    • @JagStar
      @JagStar Місяць тому

      @@lucyfuir6386 the hole would have still been to big for a 9 pin socket. I could have gotten away with it if the hole was for an octal. Thanks for commenting. 😊

    • @lucyfuir6386
      @lucyfuir6386 Місяць тому

      @@JagStar ahh hard to gauge in a video. Ty for responding

  • @jonahguitarguy
    @jonahguitarguy Місяць тому

    I dealt with a push button breakers 20 years ago and could not find replacements. I hope it's different up where you are.

    • @JagStar
      @JagStar Місяць тому

      @@jonahguitarguy yeah. A friend of mine, who is the electrical contractor, said the same thing. He’s going to bring in a new one.

    • @jonahguitarguy
      @jonahguitarguy Місяць тому

      @@JagStar oh good, glad you won't be hating yourself later when a breaker goes bad.

  • @onesoulthrust
    @onesoulthrust Місяць тому

    That shop keeps shrinking! :D

    • @JagStar
      @JagStar Місяць тому

      @@onesoulthrust LOL

  • @jonahguitarguy
    @jonahguitarguy Місяць тому

    It will make it much nicer to work when you feel less crowed. Good ideas for rearranging.

    • @JagStar
      @JagStar Місяць тому

      @@jonahguitarguy thanks Dane. Got a bunch of stuff done today. I’ve got the next three videos in the can. I’ve never worked this efficiently before! I must be more motivated than I thought. 😂

    • @jonahguitarguy
      @jonahguitarguy Місяць тому

      @@JagStar well when you make a video about what you need to do. Better do it!

  • @onesoulthrust
    @onesoulthrust Місяць тому

    It's time!

    • @JagStar
      @JagStar Місяць тому

      @@onesoulthrust Yes, enough with the confusion already 😊

    • @onesoulthrust
      @onesoulthrust Місяць тому

      @@JagStar Always with the drama!! 😂

    • @JagStar
      @JagStar Місяць тому

      @@onesoulthrust 😂😂😂😂

  • @ergindemir7366
    @ergindemir7366 Місяць тому

    where did you get this schematic?

    • @JagStar
      @JagStar Місяць тому

      It’s a modified version of a kit preamp I got about 15 years ago.

  • @jonahguitarguy
    @jonahguitarguy Місяць тому

    Shop clean up and organization are a constant struggle for me. I keep adding shelves and small totes in an attempt to get it under control. Good luck Jag!

    • @JagStar
      @JagStar Місяць тому

      My biggest issue is that I don’t really have actual tool storage. Most of my tools are piled up on countertops or any other flat surface and I can never find things when I need them. I’ve got lots of plans for fixing this over the next couple of months. 😊

    • @jonahguitarguy
      @jonahguitarguy Місяць тому

      @@JagStar should be interesting.

  • @john-r-edge
    @john-r-edge Місяць тому

    This is an interesting series, great to see the creative and engineering processes. Small suggestion. Re-order the YT playlist into "viewing order" so that someone arriving late can easily watch the full series in order. As it stands it takes a lot of clicking to watch the series!

    • @JagStar
      @JagStar Місяць тому

      @@john-r-edge thanks 😊

  • @adrielrowley
    @adrielrowley 2 місяці тому

    4:14 Actually, my interest is learning about valve amplifiers in general, as I have my great grandmother's Hammond M-100 to restore (lot of carbon comps have drifted off value and the 'lyitics need replacing), a couple of German consoles (back when worth nothing), and then build my own hifi amplifier. UA-cam recommended the capacitor outside foil video and found informative enough went hunting for more videos. One of the many things I am gaining by watching the videos is ideas for the hifi amplifier. For example, I was debating on EL84s or EL86s, now here is the solution in the Hiwatt design: switch the HT and include bias adjustment. Cheers, Adriel PS Not understanding the FX, looked on their website for more information, and not one iota, apparently no longer sold. They have even removed schematics for everything.

    • @JagStar
      @JagStar 2 місяці тому

      Hey Adriel, welcome and thanks for watching! I haven’t seen the inside of a Hammond in a long time, that sounds like a great project! I love the sound of those old Hammonds. If you want it to have a lower noise floor, use metal film resistors for the plates. Use carbon comps in the signal path to keep the mojo. Definitely replace the electrolytics. That outside foil video is my most watched. Makes me wish I had done a better job! Maybe I’ll do a new version sometime. Don’t give up on Trinity Amps. Steven Cohrs, Mister Trinity Amps, retired at the end of 2022 but it was just announced yesterday that the company has been taken over by Craig Williams and he will be ramping it up again. Trinity will be re-releasing their kits, and the schematics, over the next while. I’m glad to see them back. Here’s a link to the announcement, facebook.com/search/top?q=trinity%20amps The schematics are still up on their site, just hard to find. Here’s a link to the Tube FX Loop Installation Guide, www.trinityamps.com/wp-docs/TubeFxLoopInstallation.pdf. It doesn’t have a proper schematic but there is a layout which gives you enough information to figure out what’s going on. Cheers back, Jag

  • @DannyDKNYC
    @DannyDKNYC 2 місяці тому

    Nice neat work!

    • @JagStar
      @JagStar 2 місяці тому

      Thank you.

  • @thefilmalliance
    @thefilmalliance 3 місяці тому

    This was awesome. Great work!

  • @LaurenceMollerup
    @LaurenceMollerup 3 місяці тому

  • @jonahguitarguy
    @jonahguitarguy 3 місяці тому

    That was cool!

    • @JagStar
      @JagStar 3 місяці тому

      Thanks Dane. Was a fun thing to do. I'll be going out to a dark sky preserve in July and really hope3 to nail a really good lapse.

  • @onesoulthrust
    @onesoulthrust 3 місяці тому

    Take care of yourself JagStar. 💔❤‍🩹💜❤❤‍🔥

  • @onesoulthrust
    @onesoulthrust 3 місяці тому

    ❤‍🩹

  • @jonahguitarguy
    @jonahguitarguy 3 місяці тому

    Man, it’s so hard loosing our little pups. My heart goes out to you.

    • @JagStar
      @JagStar 3 місяці тому

      Thanks Dane. I thought I was prepared, I wasn’t. 💔

  • @LaurenceMollerup
    @LaurenceMollerup 4 місяці тому

    Really glad you are taking safety seriously. I'm definitely not going to be poking around in there!

  • @CaptainJack2048
    @CaptainJack2048 4 місяці тому

    Thank, these explanations are very helpful, and well presented. I've worked on digital electronics for many years, and only in the last two or three have I been learning more about linear circuits, especially for audio. Your note about a failing capacitor letting DC in where it ought not to be is very helpful. I often find myself trying to figure out a problem with a circuit and I realize that I'm thinking of the components as either working or not working rather than somewhere in between, and this sort of reality check is very helpful to my thinking.

    • @JagStar
      @JagStar 4 місяці тому

      Thanks Captain. That's one of the things about analog electronics and discrete components, most of them can kind of work until they fail outright. Sometimes a failing component will even make the amp sound better, but the eventual failure can be catastrophic. As long as nothing takes out the iron, most failures are recoverable.

  • @jonahguitarguy
    @jonahguitarguy 4 місяці тому

    Good vid Jag. Love the shirt!

    • @JagStar
      @JagStar 4 місяці тому

      Thanks. My shirts only speak truth LOL.

    • @jonahguitarguy
      @jonahguitarguy 4 місяці тому

      @@JagStar ABSOLUTLEY!!

  • @victormarinelli5660
    @victormarinelli5660 4 місяці тому

    I'm not sure where my comment about Chris went but I hope it either appears here and/or is sent to him.

    • @JagStar
      @JagStar 4 місяці тому

      I can see it below this one. Maybe your cache just needs to catch up. I replied to it. Let me know if it doesn’t show up for you in the next while.

  • @victormarinelli5660
    @victormarinelli5660 4 місяці тому

    It's nice that Chris took the time to comment on your post. I appreciate the information he offers on his channel. I'm new to pick up winding and Chris was the first person that came to mind when I had questions about winding. I sent him an email about resources for pick up winding and his response was a very cold "no" My initial thought was, okay, you're just a dick head and I immediately unsubscribed from his channel. I thought his response was extremely rude. My impression of youtubers like Chris is that they have a desire to help people. Certainly not the case with him.

    • @JagStar
      @JagStar 4 місяці тому

      I’m sorry you had that experience with him. I’m not a winding expert but will answer questions if I can. Thanks for watching.

    • @victormarinelli5660
      @victormarinelli5660 4 місяці тому

      Thank you. I appreciate your reply.

  • @jonahguitarguy
    @jonahguitarguy 4 місяці тому

    Very well thought out Jag. I don't do this stuff, just guitar circuits. So this is pretty over my head but it's still interesting.

    • @JagStar
      @JagStar 4 місяці тому

      Thanks Dane. I’m enjoying this build quite a bit.

  • @CaptainJack2048
    @CaptainJack2048 4 місяці тому

    Thjis is fun, I'm looking forward to the next one. For what it's worth, plowing through a circuit design and forgetting something like an indicator light is something I do all the time.

    • @JagStar
      @JagStar 4 місяці тому

      Thanks again Captain. Yes, the march of time has definitely affected my ability to pay attention! LOL

  • @pafnoocy
    @pafnoocy 4 місяці тому

    Hi! I've been wondering why you need C3 in the circuit - if you leave it out, the DC cathode voltage of V1 will still be isolated in the circuit by C2, C4, C5 and C6. Or is there something I'm missing?

    • @JagStar
      @JagStar 4 місяці тому

      I was afraid someone would ask about that part of the circuit! 😂 That feedback circuit was added at the suggestion of Kevin O'Connor from London Power. The circuit I'm building was drawn quite a few years ago and, except for the feedback circuit, is pretty straight forward. I'm not sure I have the workings of it clear in my mind anymore but, I think C3 is there to keep the circuit stable at low frequencies. If anybody has more input, please feel free to chime in.

    • @pafnoocy
      @pafnoocy 4 місяці тому

      @@JagStar Looking at it again, I have doubts about the value of C2 - 47n seems a pretty low value considering the lew impedance of the cathode of V1. I'm afraid that low frequences wouldn't be affected by the feedback loop. If I'm allowed a suggestion, how about changing C2 to 22uF and leaving out C3 altogether?

    • @JagStar
      @JagStar 4 місяці тому

      @@pafnoocy Thanks for the suggestion. I'll probably play around with it some, so will try your suggestions. Unless I'm looking at it wrong, that's a positive feedback loop and I've never really played around with that. I recall discussing this part of the circuit 15 years ago when it was suggested and it made sense to me then. To be honest, after that much time, I'm trying to get my head around it again.

    • @JagStar
      @JagStar 4 місяці тому

      @@pafnoocy This build is based on a bass preamp kit I bought from London Power about 15 years ago but never built. That part of the circuit has had me scratching my head since I first got the original kit. That's partly why I chose to base the build on it, so I could learn what it does. I just sent an email to London Power with a scan of the original schematic (I'm building a modified version) to see if I can get Kevin's input. If I hear back, I'll probably do some discussion of it in an upcoming video. Thanks for challenging me! I really appreciate how this discussion has made me take a closer look at both positive and negative feedback circuits.

    • @JagStar
      @JagStar 4 місяці тому

      Sorry it's a negative feedback loop, I had my head on backwards yesterday.

  • @CaptainJack2048
    @CaptainJack2048 4 місяці тому

    This is great, thank you very much. I'm very interested in this amplifier development, and I found this video to be very informative.

    • @JagStar
      @JagStar 4 місяці тому

      Thanks very much Captian.

  • @MusicChannel-rf5zz
    @MusicChannel-rf5zz 4 місяці тому

    Thanks! Is this capable of running on US voltage as well as 220 voltage as in UAE countries?

    • @JagStar
      @JagStar 4 місяці тому

      Yes, it came with the connector heads for different countries. I’m in Canada so it’s always running 120. All you need to do is connect the head for the country you are in.

  •  4 місяці тому

    should be V1A V1B, cause it's the same valve ;)

    • @JagStar
      @JagStar 4 місяці тому

      Good catch, you are quite right. Missed that when I was editing. Thanks

  • @LaurenceMollerup
    @LaurenceMollerup 5 місяців тому

    Great to see this taking shape!

    • @JagStar
      @JagStar 5 місяців тому

      I’m really enjoying it.

  • @paulcox6566
    @paulcox6566 5 місяців тому

    Hi there. I bought one of these today and was wondering if a power supply had been included. So thanks for showing this, I now have to wait a few days for delivery and before my New Gear Day. Thanks for the video.

    • @JagStar
      @JagStar 5 місяців тому

      Thanks for watching and commenting. The Captor X is awesome! You’ll have a lot of fun with it and the tones are amazing.

  • @jackmatthews2840
    @jackmatthews2840 5 місяців тому

    So there is 2 of you?

    • @JagStar
      @JagStar 5 місяців тому

      It feels like there should be. 😂 Thanks for watching.

  • @Charlie-zk2ql
    @Charlie-zk2ql 5 місяців тому

    The heater wiring is VERY critical to get right. Look at it like an antenna, broadcasting 60hz, inside the amp, and the pre-amp is the receiver. Twist them uniformly, and TIGHT, keep them exactly the same length, have them run AWAY from the grids at 90 degree angles. Keep that AC as FAR away from everything else as possible. You can't make the magnetic field go away, the goal is to make the fields on the two wires CANCEL EACH OTHER OUT! Don't forget a hum balance pot, to the chassis, or 2 100 ohm resistors as a virtual ground. No RANDOM grounding scheme! Don't run ANY current THRU the CHASSIS! One ground, in one place, right at the center tap secondary grounds and filter cap ground. Keep grid circuits AWAY from plate circuits. It's NOT about parallel pretty to the eye wiring. Don't make little "Air Core Transformers" with your leads. All three leads to a triode, perfectly parallel and together is the WORST WAY! It may LOOK cool. But leaking output signals back into a input signal, is how you make an oscillator! Af you do that, at a frequency higher than you can hear, all your power can be wasted making THAT "Dog Whistle". STUDY first, then build. Very carefully. Time is better spent on a precise, proper lead dress build, than to waste more time trying to track down a mystery problem you can't see. There is a proper, well established and time tested lead dress method. Learn it, and follow it. An amp is just a few parts shy of a RADIO, or a signal generator. EVERY wire counts. And remember, a tube amp will kill you faster than a wall socket. Have a clip jumper from B+ to ground, anytime, and all the time, you work inside! Better to forget and blow a fuse, than to forget and get blown across the room... Watch this video over and over until you "Get It". This is the right way for a British style amp. Fender style is the opposite. Straight UP, and Across. Both work, for a reason. There is a DIRECT relationship between your heater wiring, and the hum level of the amp. Your build can LOOK and SOUND awesome. But the HUM level separates an amateur build from one you can proudly use.

    • @JagStar
      @JagStar 5 місяців тому

      Thanks for the in-depth post.

  • @carlrudd1858
    @carlrudd1858 5 місяців тому

    No need for concern about outside foil with modern film caps etc. Maybe in some outlying instance, depending.

  • @onesoulthrust
    @onesoulthrust 5 місяців тому

    Thanks for the update. RIP Mr. Weber.

  • @jonahguitarguy
    @jonahguitarguy 5 місяців тому

    You're going to be busy. That guitar is going to be great. I like your wood choices. I know nothing about amp circuits but I'm very interested in the bass pre-amp. Should be fun!

    • @JagStar
      @JagStar 5 місяців тому

      Thanks Dane. I am going to be busy, but I like having lots to look forward to. The preamp is going to be a fun project and I’m hoping my brother will contribute a demo (he’s a monster 😊).

    • @McDGuitars
      @McDGuitars 5 місяців тому

      I feel the same! Good work Jag

    • @JagStar
      @JagStar 5 місяців тому

      Thanks Mickey 😊